A/C AUTO AMP.: Diagnosis Procedure

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.

CHECK A/C AUTO AMP. POWER SUPPLY

Turn ignition switch OFF.
Disconnect the A/C auto amp. connector.
Turn ignition switch ON.
Check voltage between A/C auto amp. harness connector M37 terminals 17, 20, 40 and ground.

TERMINAL VOLTAGE CHART

(+)		(-)	Voltage
A/C auto amp.		-	Ignition switch position
Connector	Terminal	-	OFF	ACC	ON
M37	17	Ground	Approx. 0V	Battery voltage	Battery voltage
	20		Approx. 0V	Approx. 0V	Battery voltage
	40		Battery voltage	Battery voltage	Battery voltage

Fig 1: Checking Voltage Between A/C Auto Amp Connector M37 Terminals 17, 20, 40 And Ground

Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: GO TO 3.

NO: GO TO 2.

CHECK FUSE
Check 10A fuses [Nos. 3, 6 and 17, located in the fuse block (J/B)].

NOTE: Refer to "TERMINAL ARRANGEMENT ".

Is the inspection result normal?

YES: Check harness for open circuit. Repair or replace if necessary.

NO: Check harness for short circuit. Repair or replace if necessary.
CHECK A/C AUTO AMP. GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check continuity between A/C auto amp. harness connector M37 terminals 19, 39 and ground.
19, 39 - Ground: Continuity should exist.

Fig 2: Checking Continuity Between A/C Auto Amp Connector M37 Terminals 19, 39 And Ground
Courtesy of NISSAN MOTOR CO., U.S.A.

Is the inspection result normal?

YES: Replace the A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

NO: Repair the harnesses or connectors.